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The CSL airbox. A thing of beauty both in looks and sound for the S54 engine. The E85 Z4M never received a CSL version which was solely applied to the E46 M3. That did not deter demand from Z4M owners for a CSL airbox application and Evolve Automotive is accommodating this demand. Completely stock the Z4M on Evolve Automotive's Dyno Dynamics put down a respectable 269 horsepower to the rear wheels.

With the CSL style airbox and Evolve Alpha-N tune? 290.8 wheel horsepower. Very solid naturally aspirated gains of just over 30 horsepower at the wheels on a fairly conservative dyno. Keep in mind a tune is necessary to maximize the gains with the airbox just as BMW had to do with the E46 M3 CSL.

That sound is amazing. I love this car, and love the engine more. I think it's the best engine BMW M has ever made all things considered... A few years back, 30+ NA rwhp was unheard of on this engine - this is good stuff. I want.

Add SuperSprint headers and a mid-pipe and its a dream to drive. Had an M3 with this setup with full SS from the header back...i loved everything about it. Power everywhere, powerband smooth like a Porsche..almost considered buying the M3 over a 911